Lighting Design Glossary

Radiometry

the science of quantifying the phenomena of
electromagnetic radiation.

In our context, we are interested in light, the limited
range of electromagnetic radiation that is visible to
the human eye, sometimes extended to the areas of
infrared and ultraviolet. We also don't care
about the quantum mechanical aspects of radiation.
It will be enough to measure the physiologically
perceiveable effects. For that purpose, we will often
resort to the related field of photometry.